Improvement in machines for screw-threading rods



2 Sheets--Sheet1.

n. BOEKLEN. Machines for Screw-Threading Bods.

Pa'tent'ed Oct. 13,1874.

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'2'Sheets--Sheet2. n. anemia. Machines for Screw-Threading Bods; No.l5 5,92 0.

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UNITED STATES.

PATENT OFFICE.

REINHOLD BOEKLEN, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN MACHINES FOR SCREW-THREADING RODS.

Specification forming part of Letters Patent No. l55,920, dated October 13, 1874; application filed October 3, 1874.

To all whom it may concern:

Be it known that I, REINI-IOLD BOEKLEN, of the city, county, and State of New York, have invented certain new and useful Iniprovements in Machines for.Rolling Screws;

and I do hereby declare the following to be a full, clear, and exact description thereof, reference being hadto the accompanying drawing, and to the letters of reference marked thereon, forming part of this specification.

This invention relates to the combination of a concentric rotary loose guide for carrying a screw'blank with a pair of dies or working faces, one working face or die passing the other, which is stationary; and in certain construction and arrangement of parts, as will be hereinafter more fully set forth.

In the annexed drawings, Figure 1 represents a plan, Fig. 2 a front view, partly in section, and Fig. 3 a longitudinal section, of my improved machine for rolling screws. Fig. 4 represents a detached view of the dies, guide, and hopper, and the mechanism for operating the gate of the hopper. Fig. 5 repre sents a cross-section of the dies and guide.

111' carrying out my invention, one die rotates, operating with the M concave working face of another, which is stationary.

I construct a strong frame, A, which has a central bearing, B, in which the shaft 0 of the rotary die D revolves; and opposite the periphery of the moving die D the stationary die E is arranged, which has an inner periphery for its working face, capable of operating with the working face or outer periphery of the rotating die D, to admit of a blank being rolled between them, said dies having their workin g faces screw-threaded in the ordinary manner. The top, bottom, and sides of the stationary die E are made right angular, except at the working face, and the die is retained in position by a flange, F, attached to the frame A. This flange is provided with setscrews G G, to adjust and hold the stationary die E in its proper relative position to the rotatin g die D. The rear side of the stationary die E rests against the set-screws H H, attached to the face or front of the frame A. The front side of the stationary die E is covered by a plate, I, which is bolted to the front edge of the flange F. Set-screws H are arranged in the plate I, by means of which and the set-screws H H the position of the stationary die E maybe adjusted, and, when ad justed, may be clamped and held firmly in position. The front end of the main shaft 0 is supported in bearings upon a standard, J, which is bolted to the projecting arm K and leg L, which are connected with the main frame A. A hopper, N, is arranged at the upper part of the machine, and provided with a false bottom or gate, 0, through which blanks are fed to the guide M. This guide M is formed in two parts, M M one of which, M is fitted against the front side, and the other, M against the rear side, of the rotatind die D. Both parts are made with central bosses or hubs, fitted to revolve loosely upon the main shaft 0, and each has two arms, I and P one extending upward, and the other downward. A erosspiece, P connects the downward-projecting arms. The upward-extending arms I P have in their ends corresponding notches Q, and have plates Q Q. secured to and connecting them, which plates are left far enough apart to admit a screwblank and retain it in position parallel to the axis of the die D, and across the working face of the same, so that, as the die is rota-ted, it will be brought down along the face of the die E, and rotated by the friction of the die. The rotating die D is secured upon a strong collar, R, which is attached to the main shaft 0. The die D circumscribes only a portionof the periphery of the collar R, which is of smaller diameter than the die,and is formed with flanges R R to which the said die is bolted, as shown in Figs. 3 and 5. The crosspiece P connecting the downward-projecting arms P, has a set-screw, P arranged to come in contact with the flange R to which the finishing end of the rotating die D is atfixed. Around the main shaft 0 a spiral spring, S, is placed, which has one end secured to the main shaft 0, or to a collar secured on the same, and the other presses against a stud, S, on the guide M, the purpose of which is to stop and regulate the position of said guide by causing it to strike against the flange R and, in consequence, bring the notches Q for receiving the blank opposite the commencing end of the die D, and ready to receive a fresh blank when brought to the top by the rotation of the shaft 0. The guide M is held in this position as soon as it arrives under the gate 0 of the hopper N, and while passing to the commencing end of the stationary die E; but as soon as the blank has been received between the commencing end of the dies D E, and begins to roll between the said dies, the speed of the guide M decreases from that of the revolving die, more or less, according to the diameter of the blank, and the spring S yields to the retarding action of the guide, allowing the latter to accommodate itself to the speed of the blank until it has passed the finishing ends of the dies D E. The position of the guide M and its notches Q Q at this time is downward, and the blank is discharged;

remain positively against the flange R while passing the gate 0 to receive a blank, and until said blank is placed between the commencing end of the dies D E, I employ a spring-pawl, T, on the side of the guide M, one end of which is forced by a spring into a notch in the die D at the moment that the guide strikes against the flange R which locks the guide and die D together. The pawl T is withdrawn from the die D to unlock the guide M by means of an adjustable stud, U, secured to the standard J, and adjusted to come in contact with the rear arm of the pawl T at the time that the blank comes between the communicating ends of the dies D E. The gate 0 of the hopper is operated by a rod, 2, connected to a crank of a rocking shaft, V, arranged above the revolving die D and parallel to its axis. Motion is communicated to the shaft V by means of a stud, X, either secured to the die D or the rear part of the guide M, as shown in Fig. 4. From the shaft V a loose arm, W, extends downward, provided with stud W which comes in contact with a rigid arm, V which is secured to the shaft V, and operates the finger V through the medium of a spiral spring, in order that, at the time the said guide M is under the gate 0 of the hopper N, it may open the gate 0 and receive a blank from the hopper N. A connecting-rod, Y, is fastened to the loose arm W at one end, and at the other with the arm Yof the shaft V To make more certain that the blank shall drop at the proper time into the notches Q Q of the guide M when operating the machine rapidly, and when blanks of limited weight are used, I employ one or more spring-fingers, V to touch or press upon the blanks to be fed, carried by a rocking shaft having an arm, V affixed thereon, to come in contact, at the proper time, a

with a stud, W on the loose arm W, and thereby cause the spring finger or fingers V to press the blank down at the proper time to meet the notches Q Q in the guide M. To retain the blank in its proper position longitudinally I employ an adjustable stop-piece, Q on the cross pieces Q and an adjustable stop, Q, on a horizontal rod, Q ,..pro ecting from and secured to the front part of the guide M.

.The machine is used for threading bolts, and the dies D E have their working-surfaces at a right angle to their front and rear sides. which surfaces are provided with screw-threads to produce the screw-thread required. In order to obtain a gradual increase in pressure upon the blank, either or both of the working-surfaces are, in my machine, placed somewhat nearer together toward the finishing ends of the dies D E. When it is required to thread taper or gilnlet-pointed screws the workingsurfaces of the dies D E are made to correspond, and at the rear are formed with increasing taper toward each other for that purpose. The tapered portion in this case, as well as the parallel portions of the faces of the dies D'E, are threaded alike, so that, when threading gimlet-pointed screws, the shanks are threaded between the parallel portions of the said dies D E, whereas the point of the screw or gimlet is threaded in'the raised taper portions. j

Having thus fully described my invention,

what I claim, and desire to secure by Letters Patent, is-- v l. The combination of the rotating die D, concave die E, and the loose guide M, as and for the purpose set forth.

2.-The combination of the dies D and E, loose guide M, shaft 0, and spring S, as and for the purpose described.

; 3. In combination with the die D, the loose guide M, spring S, spring-pawl T, and stud U, as and for the purpose herein specified.

4. The combination of the dies D and E, hopper N, gate 0, and mechanism for operating the gate, loose guide M, and spring S, substantially as and for the purpose set forth.

In witness whereof I hereunto set my hand this 30th day of July, 1872.

REINHOLD BOEKLEN.

In presence of- J os. AINsLIE, J r., ZENO ATTERBURY, Jr. 

